Rehearsals are continuing in Croke Park for the opening ceremony of the Special Olympics later today.
Some of the biggest names in Hollywood, sport and music, including Arnold Schwarzenegger, Frankie Fredericks and Bon Jovi will be there.
Special guests also include Muhammed Ali and Nelson Mandela.
The show will include live performances from Riverdance, U2, Macnas and a range of other acts.
The ceremony starts at 7pm.